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TEAMS and eXpress are two typical commercial softs for testability modeling and analysis. The model used in TEAMS is multi-signal model. The model used in eXpress is hybrid diagnostic model. These two models are all testability schema models. The article compares multi-signal model and hybrid diagnostic model in representation of product structure,port,function,failure mode,test,etc. Based on the comparison,a new testability schema model – port signal model is proposed. The info flows of ports are look as signals in port signal model. Signal mapping definition is extended,and multi-outcome test can be modeled in port signal model. So port signal model can be made from circuit netlist file automatically,also can describe the dependency of faults and tests more accurate.