Combined with practical design the arrangement and design of residential toilet are elaborated from the selection of sanitary apparatus, pipe laying, middle waterway design and other aspects; at the same time some suggestions are proposed.

In allusion to the problems of household measurement and room adjustment design of heating system, this paper states technique problems in design and construction such as system composing and pipe laying.

The existing problems in water supply and drainage design of multistoried house are discussed from pipe laying and material selection.

It summarizes several ways of pipeline laying in that re-gion and some insulatio n materials as well as related techniques.

Caterpillar rock trencher will play an important role in practical pipeline laying process.

Secondly, it discuss es some practical problems on the design such as the system composition, the way s of pipeline laying, stem pipes and thermameters installing.

Many factors shall be considered in terms of stress analysis of offshore pipelaying, including the curvature and length of pipe carrier, the tension and buoyancy on pipeline, pipe coating, and the mdeium to be transported.