Abstract: Based on analysis to the relationship between the fixation rate and the factors such as alkali, batching temperature, neutral salt and dispersant, this paper discussed the optimization conditions of cold pad-batch dyeing process of silk fabric with vinylsulfone reactive dye and hetero-bifunctional-group reactive dye. The results show that the satisfying effect of silk cold pad-batch dyeing can be obtained using the alkaline agent composed of soda ash and caustic soda with 20g/L Na2CO3, 1-5g/L NaOH, 0-20 g/L NaCl and 0-1g/L dispersant batching up to 8-12h at 25-30℃, and applying the appropriate processing conditions according to the types of dyes.