Experimental results yield an in band //P3 of over 31 dBm at 0 dB gain,a 54 dB gain range with 6 dB gain step and a continuous frequency tuning range from 0.25 MHz to 4 MHz.In band ripple is less than 1.4 dB at high gain mode, while gain error and frequency tuning error are no more than 3.4%and 5% respectively.The design which is fabricated in 0.18-um CMOS process consumes 12.6mW power at 1.8 V supply and occupies 1.28 mm2. Key Words:channel select filter;high linearity;gain adjustable;multi-band; continuous adjustment;TV Tuner Classification Code:TN4Experimental results yield an in band IIP3 of over 31 dBm at 0 dB gain, a 54 dB gain range with 6 dB gain step and a continuous frequency tuning range from 0.25 MHz to 4 MHz. In band ripple is less than 1.4 dB at high gain mode, while gain error and frequency tuning error are no more than 3.4% and 5% respectively. The design which is fabricated in 0.18-μm CMOS process consumes 12.6mW power at 1.8 V supply and occupies 1.28 mm2 . Key Words: channel select filter; high linearity; gain adjustable; multi-band; continuous adjustment; TV Tuner Classification Code: TN4