Abundant researches approve that the bank-lending channel is the main monetary transmission channel in China recent years. But the most of investigations only focus on the behavior of the gross bank-lending index in the monetary transmission, and the further investigation hasn't been carried on. This paper divides the gross index of bank lending into the short-term and mid-, long-term loans based on the internal and external researches. It analyzes how the financial institutions adjust their lending policy under the impact of the monetary policy of the central bank and the effect of the adjustments on the macroeconomic, making the further study of the bank-lending channel in monetary transmission in China.