The accuracy of completing a task has always been the main evaluation index in the large-scale assessment.However,during a variety of task situations,all the indexes indicating the quality of the doers are extremely important,including the correctness of the result as well as the timeliness of the decision-making process.Therefore,the precision of results and fluency level of reaction should be regarded as the two indispensable indexes that evaluate the quality of each individual in finishing tasks.Grounded on the research of speed and accuracy in cognitive experiment,the manuscript will make the cognitive experiment of the speed-accuracy tradeoff model out of the lab and make it a large-scale assessment of model that can be applied to more complex situations of cognitive tasks by building a psychometric model based on the speed-accuracy tradeoff.The new psychometric model of parameters based on speed-accuracy tradeoff can be estimated very stably and accurately.At the same time,the variables of model and their relations can be well supported by the real data.Finally,the quality of the subjects can be evaluated from different methods by the speed-accuracy tradeoff model.