The invention discloses a method for amplifying a mouse monoclonal antibody heavy light chain gene sequence, primers thereof and a method for screening the primers. Forward primers used by all composite primers are all compositions, the composite primers are obtained by screening primer pairs capable of amplifying non-functional gene sequences in advance, and moreover, the primers for amplifying aSp2 / 0 cell non-functional light chain gene are removed from each group of the forward primers, PCR amplification is performed by using the composite primers, the obtained primers do not require TA cloning, the purity requirement of sequencing can be met, further, the number of the amplification tubes can be reduced by using the composite primers, the amplification operation can be simplified, thedetection sensitivity can be improved, and the PCR amplification operation is simpler and more convenient.