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A new landslide detection technique that installs a transmitter (Tx) array at the area of interest to transmit signals to two receivers is presented. It detects the phase difference change, due to the Tx displacement, at the dual-receiver system to monitor near real time of small but critical area landslide in centimeter range. The dual-receiver system, apart at a small distance, demodulates the receiving signals independently but coherently. An ambiguity route, which corresponds to a landslide's movement without change on phase difference, is defined and must be avoided. No field test was tried, but three simulated examples are given to illustrate the technique.