Sulphide soil is the dominating fine-grained soil type along the east coast of the northern part of Sweden. A sulphide soil typically consists of clay and silt fractions with various and smaller content of sand. Sulphide soil may contain high amounts of iron mono sulphides (FeS) and organic content up to about 10%. A fine-grained sulphide soil normally shows low strength and high compressibility. Previous research concerning strength and deformation properties of Swedish fine-grained soils has very little included sulphide soil. It has been found that field and laboratory methods used to determine properties of other fine-grained soils, are often not suitable for sulphide soil.In this paper results from field and laboratory testing of fine-grained sulphide soil are presented and discussed. In the field, field vane tests, CPT-tests, dilatometer tests, seismic CPT-tests and undisturbed sampling are conducted. In the laboratory, triaxial tests, direct shear tests, oedometer tests, CRS-oedometer tests, routine tests of basic geotechnical properties and tests to determine chemical properties are done. In the laboratory, testing is carried out in room temperature as well as for in situ soil temperature for samples handled either at normal air conditions or at air free conditions.The main purpose of the research project is to find suitable testing methods in field and laboratory to determine mechanical properties of fine-grained sulphide soils. This includes how the results should be interpreted and evaluated and how samples should be sampled, transported, stored, handled and tested. In the paper the first part of the project is reported, including comparisons between properties and parameters determined in field and in laboratory. Effects on mechanical properties of testin g in room temperature versus in situ soil temperature and effects of handling the sample at air free conditions or not, are presented.