1. Disharmonious personality: Zhang Tao and his wife are very different in personality, and they often have conflicts, which leads to emotional disharmony between them.

2. Busy at work: As a duet, Zhang Tao is very busy at work, often needs to perform in various places, and spends more time with his wife.

Family problems: Zhang Tao and his wife have some problems in their family life, such as living habits and family relations.

4. Personal reasons: There are some problems in Zhang Tao's personal habits, words and deeds, which lead to emotional disharmony with his wife.