I. Introduction fluid loss is a new agent with anti-temperature, fluid loss, sticky cut and anti-collapse and other effects. But also significantly improve the rheology of the mud, mud anti-pollution ability, stable performance, good handling, easy maintenance, both for use in fresh water mud, but also for use in salt water mud system for use in deep and ultra-deep wells, the effect is more prominent. 1, with good performance, a variety of well type used in a variety of drilling fluid system. 2, plus less use in fresh water drilling fluid system, recommended dosage 1.5 --3% saline for use in the drilling system, the recommended dosage is 3--5%. 3. When using the SJ-1, mud filtrate PH value is maintained at 10 - between 10 and better. Second, the technical indicators Polymer drilling fluid loss additive test items divided Index Index Appearance gray powder Moisture% ≤10.0 minor secondary indicators Indicator 1% aqueous solution of the main indicators of apparent viscosity mPa.s ≤15.0 PH value 7 ~ 9 secondary indicators fineness (20 mesh sieve)% ≤10.0 secondary indicators freshwater slurry apparent viscosity, mpa.s base mud: 6-9 ≤20.0 minor plastic viscosity index base mud mpa.s: 3-5 ≤15.0 secondary index filtration ml base mud: 20-40 ≤15.0 main indicators composite aqueous slurry apparent viscosity, mpa.s base mud: 4-6 ≤20.0 minor plastic viscosity index base mud mpa.s: 2- 4 ≤15.0 secondary index filtration ml base mud: 50-56 ≤10.0 main indicators