Abstract: The present invention discloses an extraction and representation method of state vector of sensing data of Internet of Things, extracting and representing sensing sampling data of state vector through the method. receiving sampling data and performing vector extraction on sampling data, sampling data vector representing as a time function of f(t), adding time tstart, end time tend and unit time of vector activity of unitime, the last vector being current active vector for each component of each active sensing device; performing query of sensing sampling data, and then extracting and representing state vector, storing sensing data information with state vector, reducing update frequency of data storage and improving accuracy of interpolation query information. User inputs query time t for interpolation query, in vector sequence, obtaining vector activity corresponding time t using binary search, taking t into vector function to obtain sampling component value of monitoring object at t moment.