Equis calar pollution loading is the main method to assess industrial pollutant source,Three exising methods of equiscalar pollution loading were analyzed,and it was found that could not eliminate the effect of industrial scale on the results.Based on traditional methods,equiscalar pollution loading per product was proposed,and applied in the evaluation of industrial pollution source of on city.It is found that result of tradional equiscalar pollution loading is positively correlated with the total waste discharge of pollution source,while the equal-standard waste-loadper product can properly assess the integrated enviroment-economy attribute of pollution source.