jgg     2014 34 (6):  66-71    ISSN: 0412-1961  CN: 21-1139/TG STUDY ON RECOVERING EARTH’S GRAVITY FIELD WITH  GOCE’S SST-HL DATA 1）Xi’an Research Institute of Surveying and Mapping，Xi’an 710054 2）State Key Laboratory of GeoInformation Engineering，Xi’an 710054 3）Key Laboratory of Geospace Environment and Geodesy of Ministry of Education， Wuhan University，Wuhan 430079 4）Institute of Geospatial Information，Information Engineering University，Zhengzhou 450052 Received: 2014-01-17  Revised: null  Online: 2014-12-09 Supporting info