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根据调查统计结果，林用车辆的有效度为８５％～９０％，车辆维修费用占运输成本的３０％～４０％。运用可靠性理论，对车辆的使用和维修进行优化管理，能够显著提高运输效率，降低运输成本。文中依据塔河林业局ＣＡ１４２Ｋ２型汽车的故障间隔统计数据，对累积故障率、故障率和故障密度三个函数进行假设检验，得到分布参数。结果表明：车辆工作环境对故障率有显著影响；根据故障密度曲线，可以较精确地确定维修周期，以此为依据，科学组织生产管理；加强车辆维护，提高管理水平，能够有效降低故障率，延长故障间隔里程。
According to the survey results, the effectiveness of forest vehicles is 85% to 90%, vehicle maintenance costs account for 30% to 40% of transportation costs. The use of reliability theory to optimize the use of vehicles and maintenance management, can significantly improve transport efficiency and reduce transportation costs. Based on the statistical data of fault interval of CA142K2 vehicle of Tahe Forestry Bureau, the hypothesis tests of cumulative failure rate, failure rate and fault density are carried out to obtain the distribution parameters. The results show that the working environment of the vehicle has a significant effect on the failure rate. According to the fault density curve, the maintenance cycle can be determined more accurately. Based on this, the production management can be organized scientifically. Vehicle maintenance and management level improvement can be effectively reduced, Increase fault interval mileage.