This paper studies the sensitivity of non-critical process in program evaluation and review technique(PERT) network.

The paper introduced the technological study for PB reactor key process, relating the key process adopted technology and quality control measures, and technological study of important product key process is very important.

Briefly analyses the quality control on raw material, welding and other key processes, emphasizes the importance of check items detailed.

Qualified and fine projects can only be achieved through the following:working out programme of process control;identifying special course and key process ;providing personnel, tools, equipments and materials which can en-sure construction process achieved ssetting up process method; working according to document for control;making various of records.

This article interprets the calculation of 256 m half-through concrete-filled steel tube arch, and the construction process and key procedure.

Combined with the seawater desalination project of Hebei Datang Wangtan power plant,it introduces the construction arrangement,main construction plans and debugging plans of the key procedures in electrical system and seawater desalination control system,which is a guidance for the future construction of this field.

Illuminate the three key porcedure of cold drivering steel pipe,to analyses how the defects are happened in the key working procedure of that by the illumination as the base.

It mainly consists of the construction and quality control of the key working procedure-setting up pore canal,reinforcing steel bar passing through,grouting,etc.

This paper presents a kind of Heuristic Approach, based on key working procedure, to the solving of Job shop scheduling problems.

According to the characteristics of the FJSP,we design a new mutation operator based on critical operations.