Abstract: As for Sun Li,declining is a turning point.This mental change,coming from physiological changes,is an obvious symptom to interpret Sun Li's life attitude in his declining years.The works of his late years,sometimes expressing "to be",occasionally "not to be",reveal his ambiguous mental process.The unbearable heaviness of being he suffered in Cultural Revolution,the understanding of life in extreme loneliness,and the yearning for death due to absolute disappointment,are the three main points of Sun Li's life attitude in his declining years.