Compared with ordinary disposable injector and disposable insulin syringe 1ml in injection dosage, accurate and accuracy aspect difference. Method: Uses the comparison research. Separately when injection dosage 4, 10, 20IU, to the ordinary 1mL disposable injector with 1mL(40IU,40IU/mL) disposable insulin syringe injector's actual dosage, the accuracy, and the accuracy carries on the comparison. Uses the weight method to carry on the examination to the actual injection dosage. The injection dosage indicated with the mean value ± standard deviation that the accuracy indicated with the relative deviation absolute value, appraises the accuracy with the coefficient of variance.