第一阶段先完成半成品，然后批量生产。中方实际签约人是中航工业。

"Mriya" The aircraft will be produced in China in 2019.
The Chinese company China Airspace and Ukrainian state enterprise Antonov August 30 signed an agreement on cooperation  in the field of aircraft in the world's largest production of AN-225 "Mriya". This was reported by China Central Television ( the CCTV ).
According to media reports, in accordance with the contract to China ownership of the aircraft AN-225, including the use of drawings and specifications of the aircraft.

Mriyu can run in serial production
"Mriyu" may run in serial production
May 28, 2016, 5:18

"Negotiations to attract Chinese investors were held in May 2016 after signing the contract with the Ukrainian company, China gained access to unique technologies in the field of aircraft construction is planned that the first Chinese AN-225 have to be released in the first half of 2019.." - He said in the message.
As mentioned, negotiations to attract Chinese investors were held in May 2016.
The GP Antonio in the denied data on the sale of rights to the Chinese. According to the information agency UNIAN , the Ukrainian delegation is now back with the negotiations that took place in China. 
The company's press service later reported that actually signed a contract with the company Aerospace Industry Corporation of China (AICC). 
As noted, according to the contract, provided at the first stage of construction of the second instance of the modernized AN-225 "Mriya" in GP Antonov and his supply of AICC. At the second stage it is planned joint serial production of An-225 in China Antonova license. Both stages will be implemented under the terms of individual contracts.
In addition the company published a photo of the fuselage of the second instance of the An-225 in the shop Antonov:

As reported May 16, thousands of Australians  greeted the landing of the largest in the world Ukrainian aircraft  An-225 "Mriya" in Australia applause and enthusiastic comments. The largest ship in the world completed the intercontinental flight and returned to Ukraine on 24 May.
AN-225 "Mriya" is the heaviest lifting aircraft ever to take to the skies (640 tons). AN-225 has been specifically designed to create an air transport system to project the Soviet space shuttle "Buran". The plane exists in a single copy.
For comparison, the third duty (after the AN-124) was an American military transport plane C-5 Galaxy has a maximum curb weight of 381 tons.