China has been hit with extreme weather in recent months, with dozens of people killed in floods last year, its warmest on record.
Scientists say climate change is making extreme weather events more frequent.
Saturday's landslide hit Jinping village in the city of Yibin at around 11:50 am (0350 GMT).
"A preliminary study shows this disaster occurred due to the influence of recent prolonged rainfall and geological factors," CCTV said, citing local authorities.
The local county government told AFP on Sunday that 29 people were still missing after two were rescued on Saturday.
"The final number is still undergoing further verification," state broadcaster CCTV said on Sunday.
Video footage published by the broadcaster on Sunday showed rescuers with flashlights searching through debris in the dark.
China's President Xi Jinping on Saturday ordered authorities to do "everything possible to search for and rescue missing people, minimise casualties, and properly handle the aftermath".
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