The goal of this clinical trial is to learn Whether the WeChat-based applet works to prevent urinary calculi for postoperative patients. The main questions it aims to answer are:

Dose the WeChat-based applet intervention increase the amount of fluid intake and urine output? Researchers will compare the WeChat-based applet intervention to a usual care to see if the WeChat-based applet works to prevent urinary calculi occurence.

Participants will:

1. Using the WeChat-based applet or a placebo every day for 3 months
2. Keep a record of their fluid intake, urine output, number of urinary calculi recurrence

The study outcomes will be reported to adhere to the guidelines outlined in the Consolidated Standards of Reporting Trials (CONSORT) 2010 statements. Reporting measures of central tendency (mean, median) and dispersion (standard deviation, range) for continuous variables, as well as frequencies and percentages for categorical variables. Statistical tests such as a t-test and chi-square test will be employed for continuous and categorical variables within two groups. The principal analysis will compare the fluid intake volume between the intervention and control groups using the t-test. Secondary outcomes such as The Wisconsin Stone Quality of Life Questionnaire (WISQOL), Patient Health Questionnaire-9 Items (PHQ-9), International Physical Activity Questionnaire (IPAQ-SF ) and The Electronic Health Literacy Scale (eHEALS) will use repeated measures of Analysis of Variance (ANOVA) since they are measured over time and between two groups. If necessary, subgroup analyses will be conducted to explore whether the effect of the intervention varies across different demographic or clinical subgroups. Intention-to-treat (ITT) analysis will be used to assess the impact of the treatment and its generalizability. A significance level of p < 0.05 will be utilized to determine statistical significance, and all data analysis procedures will be conducted using the SPSS (Statistical Product and Service Solutions) 26.0 software package.The researcher is granted access to the complete trial dataset, with a contractual agreement established with the statistician to manage the data confidentially in accordance with the research protocol.

Inclusion Criteria:

• With a history of urinary calculi and having received urolithiasis surgery before
• 24-hour fluid intake < 2500 ml
• Age ≥ 18 years old
• Able to use WeChat daily
• Able to read and write informed consent

Exclusion Criteria:

• Participants with obstructive uropathy, chronic urosepsis, renal failure, and renal tubular acidosis
• Participants with congestive heart failure, psychiatric conditions, pregnancy, and primary hyperparathyroidism
• Participants experienced complicated urolithiasis surgery.
• History of recurrent UTI (urinary tract infection) (>3/year)
• Medication use increases stone risk.
• Participants with physical disabilities

Female and Male

Datas collect from Primary outcome such as 24-hour urine volume (ml);24-hour fluid intake volume (ml) and secondary outcome such as The Wisconsin Stone Quality of Life Questionnaire (WISQOL);PHQ-9 (patient health questionnaire-9 items);IPAQ-SF (International Physical Activity Questionnaire);The eHEALS (Electronic Health Literacy Scale);The number of outpatient visits; recurrence rate will be shared. Part of the demographic data such as the time of using WeChat, gender, age, the type of surgery and BMI will shared.

The data will be available for 3 years:

The start date: 1 Dec 2025; The end date: 30 Nov 2028.

IPD and supporting information collected in this study will be accessible exclusively to accredited researchers. These researchers must be members of academic institutions or research organizations relevant to the field of this study and possess a clear research purpose along with a rational analysis plan. Additionally, researchers are required to sign a data use agreement to ensure the confidentiality and compliant use of the data.

Content Available for Access:

Researchers will have access to de-identified IPD, encompassing participants' baseline characteristics, interventions, follow-up data, and primary and secondary outcome measures. Supporting information, such as the study protocol and statistical analysis plan, will also be provided to aid researchers in understanding the data structure and analysis methods.

Mechanism of Access:

Data access will be facilitated through a secure online data-sharing platform. Researchers are required to register and submit data access application.

To ensure the integrity and objectivity of outcome assessments in this randomized controlled trial, independent outcomes assessors, who are masked to participants' group assignments, will be employed. These assessors, comprising trained research nurses and clinical research coordinators not involved in the delivery of the WeChat applet intervention or usual care, will be responsible for evaluating primary and secondary outcomes. Masking will be maintained through secure data management systems that conceal group allocation (WeChat applet vs. usual care) during data collection and analysis. The assessors will receive training on standardized outcome measurement protocols and will have no direct interaction with participants or intervention staff to prevent unmasking. This approach minimizes assessment bias, enhancing the reliability of trial results.