OBJECTIVE： To study the difference of dissolution performance of chemical component and anticonvulsant effect of Bombyx mori decoction and powder taken with water， and to provide reference for the selection of application forms of B. mori. METHODS： The yield of dry extract was determined for decoction and powder biomimetic gastric juice of B. mori. HPLC method was used to detect the content of ammonium oxalate in decoction and powder biomimetic gastric juice of B. mori. The content of protein in decoction and powder biomimetic gastric juice of B. mori was determined with bicinchoninic acid （BCA） method. Mice was divided into normal group （1％Sodium carboxymethylcellulose solution）， model group （1％Sodium carboxymethylcellulose solution）， positive group （phenytoin， 2 mg/kg） and B. mori decoction and powder suspensions high-dose， medium-dose and low-dose groups （0.75， 1.5， 3 g/kg by crude drug） according to random number table， with 20 mice in each group. After 60 min of intragastric administration， electric stimulation was conducted， and the rate of convulsion in mice was recorded. RESULTS： The yields of dry extract were 22.08％ and 26.40％ in decoction and powder gastric juice of B. mori （P＜0.05）； the contents of ammonium oxalate were 11.22％ and 16.83％ （P＜0.05）， and the contents of protein was 3.39％ and 4.92％ （P＜0.01）. Compared with normal group， convulsion rate of mice was increased significantly in model group （P＜0.01）； compared with model group， convulsion rates of mice were decreased significantly in administration groups （P＜0.05 or P＜0.01）， and the convulsion rate of mice in B. mori powder suspensions group was lower than decoction group. CONCLUSIONS： The dissolution performance of the chemical component from gastric juice of B. mori powder is better than that of decoction， and the anticonvulsant effect of B. mori powder is better than decoction.