Patients with PSD have the characteristics of high incidence rate, difficult identification and great harm. However, the existing AI chat platforms have not developed any relevant software or programs for PSD patients. Given that the chatbot function in the "Douba" software is relatively mature and can flexibly modify the corresponding intelligent agent according to user needs, this study intends to appropriately supplement and optimize the AI agent in the "Douba" software to explore the effect of the chatbot in the software in alleviating the symptoms of PSD patients.

Inclusion Criteria:

• Meets the criteria of either the "Chinese Guidelines for the Diagnosis and Treatment of Acute Ischemic Stroke" or the "Chinese Guidelines for the Diagnosis and Treatment of Acute Cerebral Hemorrhage" and is confirmed by CT or MRI;
• Patients with stable vital signs and conditions;
• Meets the "Third Edition of the Classification and Diagnosis Criteria for Mental Disorders in China" and has a score of ≥5 on the 9-item Patient Health Questionnaire (PHQ-9) scale;
• Patients are over 18 years old;
• Can understand the relevant content of the scale correctly and provide answers independently or with the help of others, have clear consciousness and sign the consent form;
• Can use smartphones.

Exclusion Criteria:

• Those with severe functional impairments of important organs such as the heart, lungs, liver and kidneys;
• Those without a smart phone;